Odd-frequency superconductivity induced in topological insulators with and without hexagonal warping

A. S. Vasenko, A. A. Golubov, V. M. Silkin, E. V. Chulkov

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We study the effect of the Fermi surface anisotropy on the odd-frequency spin-triplet pairing component of the induced pair potential. We consider a superconductor/ ferromagnetic insulator (S/FI) hybrid structure formed on the 3D topological insulator (TI) surface. In this case three ingredients ensure the possibility of the odd-frequency pairing: (1) the topological surface states, (2) the induced pair potential, and (3) the magnetic moment of a nearby ferromagnetic insulator. We take into account the strong anisotropy of the Dirac point in topological insulators when the chemical potential lies well above the Dirac cone and its constant energy contour has a snowflake shape. Within this model, we propose that the S/FI boundary should be properly aligned with respect to the snowflake constant energy contour to have an odd-frequency symmetry of the corresponding pairing component and to insure the Majorana bound state at the S/FI boundary. For arbitrary orientation of the boundary, the Majorana bound state is absent. This provides a selection rule to the realization of Majorana modes in S/FI hybrid structures, formed on the topological insulator surface.

Original languageEnglish
Article number295502
JournalJournal of Physics Condensed Matter
Volume29
Issue number29
DOIs
Publication statusPublished - 19 Jun 2017
Externally publishedYes

Fingerprint

Superconductivity
Superconducting materials
superconductivity
insulators
Anisotropy
hybrid structures
Fermi surface
Chemical potential
Surface states
Magnetic moments
Cones
anisotropy
ingredients
Fermi surfaces
cones
magnetic moments
energy
symmetry

Keywords

  • Majorana fermion
  • odd-frequency pairing
  • proximity effect
  • topological insulators

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Odd-frequency superconductivity induced in topological insulators with and without hexagonal warping. / Vasenko, A. S.; Golubov, A. A.; Silkin, V. M.; Chulkov, E. V.

In: Journal of Physics Condensed Matter, Vol. 29, No. 29, 295502, 19.06.2017.

Research output: Contribution to journalArticle

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